Butterfly type fluid control valves

ABSTRACT

The closure vane of a butterfly valve is formed at its periphery with a part-spherical surface which is engageable with a seat ring. The seat ring is free to move in a plane perpendicular to the axis of the valve passage. The pivotal axis of the vane is offset both from the center of the spherical surface and from the axis of the valve passage, so that as the vane starts to open, its periphery lifts away from the seat ring.

United States Patent Williams 1 Oct. 17, 1972 [54] BUTTERFLY TYPE FLUIDCONTROL 3,025,035 3/1962 Swain ..251/306 VALVES 3,156,445 11/1964 Swain..25l/307 X 3,250,510 5/1966 Williams ..251/l73 [72] Invent 3223" Newpm3,282,558 11/1966 Swain ..251/173 x 731 Assignee: Selck IndustriesLimited, Bir- FOREIGN PATENTS OR APPLICATIONS 1 mingham, gland 927,5025/1963 Great Britain ..25l/306 Oct. Great Britain [2,1] Appl. No.:865,317 Primary Examinerl-lenry T. Klinksiek Attorneyl-lolman & Stern 30] Foreign Application Priority Data ABSTRACT 1968 Great Bmam "48847/68The closure vane of a butterfly valve is formed at its [52] U S Cl251/306 periphery with a part-spherical surface which is en- [51 1 In}.0 U228 g g with a seat ring. The seat g is free to move in a planeperpendicular to the axis of the valve [58] Fleld of Search "25l/306 173passage. The pivotal axis of the vane is offset both from the center ofthe spherical surface and from the [561 References cued axis of thevalve passage, so that as the vane starts to UNITED STATES PATENTS open,its periphery lifts away from the seat ring. 2,980,388 4/1961 White.....251/298 X 3 Claims, 1 Drawing Figure !9 2O /-22 L l5 6 H ---17 i laL PATENTEDBCT 17 I972 JNVENTOF? I BYWvM' ATTOEN EYS BUTTERFLY TYPE FLUID-CONTROL VALVES This invention relates to butterfly type fluid controlvalves and has an object to provide such a valve in a convenient form Abutterfly type fluid control valve in accordance with the inventioncomprises a body having a through passage, said body being provided withan internal circular recess at one end of the through passage, adetachable annular retaining member positioned in the recess provides aninternal annular groove, a mounting ring within the annular groove anddisplaceable in the groove a plane perpendicular to the axis of thethrough passage, a sealing element positioned between the mounting ringand the body, a seat ring carried by the mounting ring, said seat ringhaving an inner face extending into the passage and a face engaging thebody inwardly of the sealing element, a valve closure member defined bya disc having a part spherical peripheral surface, means pivotallymounting the disc to the body to be axially offset from the plane of thedisc and from the axis of the through passage, the part sphericalperipheral surface of the disc being engageable with the inner face ofthe seat ring, and when the valve is shut, the center of the partspherical peripheral surface of the disc is the same distance from theplane of the disc as the axis of the pivotal mounting means, and thecenter of the part spherical peripheral surface lies on the axis of thethrough passage.

Reference is now made to the accompanying drawing which is a somewhatdiagrammatic cross-sectional view of one example of a butterfly typevalve in accordance with the invention.

The valve shown includes a body having a through passage 11. The passage11 passes through a valve chamber 12 at one end of which there is aninternal circular recess 19. An annular retaining member denotedgenerally is provided with a first flange 21 and a second flange 22extending at right angles to the flange 21. The flange 21 is located inthe recess and the length of the flange is substantially equal to thedepth of the recess 19 so that the outer surface of the flange 22 isflush with the body'10. The outer diameter of the retaining member 20substantially corresponds to the outer diameter of the recess. Themember 20 is detachably secured to the body 10 by means of bolts or thelike 23. It will be appreciated that the retaining member 20 togetherwith the base of the recess 19 provides an annular groove 13. Within thegroove 13 is a mounting ring 14 which is displaceable in a planeperpendicular to the axis 11a of the through passage 11. The mountingring 14 carries a sealing element 15 which engages the body 10 and alsocarries a seat ring 16 which has an inner face extending into the valvechamber 12 and also has a face engaging the body 10. Both the sealingelement 15 and the seat ring 16 are resiliently deformable.

Mounted in the valve chamber 12 is a closure member 17 which is in theform of a disc having a part spherical peripheral surface. The disc ispivotally mounted by means of a spindle 18 which is offset axially fromthe plane of the disc 17 and is also offset from the axis 11a of apassage 11. The spherical peripheral surface of the disc 17 has itscenter at a point which lies on the axis 11a of the passage 11 when thedisc extends in a plane perpendicular to the axis of the passage 11.

When the disc is in this position the center-of the part sphericalsurface is offset from the plane of the ring 14 by the same distance asis the axis of the spindle 18.

With a valve as above described, fluid tight closing of the valve doesnot rely on an interference fit between the valve disc and its seat asin conventional butterfly valves. The combination of the offset of theaxis of the spindle 18 both from the plane of the disc 17 and from thecenter of the peripheral surface of the disc 17 causes the periphery tolift away from the seat ring 16 as the disc 17 is rotated anticlockwiseas seen in the drawing, thus closing pressure can be applied to the discthrough the intermediary of the external operating mechanism thereof(not shown) so that the disc is actually pressed against the seat ring16. Any inaccuracies in the dimensions of the disc 17, ring 14 or seatring 16 are taken into account in this construction since, in the casewhere the disc 17 is undersized, the spindle 18 is turned beyond itsnormal closed position and the ring 16 can slide to anew radial positionto take into account the radial displacement of the spherical centerfrom the axis 11a of the passage 11. Thus, inaccuracies which ariseduring manufacture of the valve as well as inaccuracies which arise as aresult of wear of the valve are taken into account. 7

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

I 1. A butterfly type fluid control valve comprising a body having athrough passage, said body being provided with an internal circularrecess at one end of the through passage, an annular retaining memberhaving a first flange and a second flange extending at right angles tothe first flange, said first flange being positioned in the recess, withsaid flanges cooperating with the recess to provide an internal annulargroove, means detachably securing the annular retaining member to thebody, a mounting ring within the annular groove and displaceable in thegroove in a plane perpendicular to the axis of the through passage, asealing element positioned between the mounting ring and the body, aseat ring carried by the mounting ring, said seat ring having an innerface extending into the passage and a face engaging the body inwardly ofthe sealing element, a valve closure member defined by a disc having apart spherical peripheral surface, means pivotally mounting the disc tothe body to be axially offset from the plane of the disc and from theaxis of the through passage, the part spherical peripheral surface ofthe disc being engageable with the inner face of the seat ring, and whenthe valve is shut, the center of the part spherical peripheral surfaceof the disc is the same distance from the plane of the disc as the axisof the pivotal mounting means and the center of the surface lies on theaxis of the through passage.

2. The valve as claimed in claim 1 in which the seat ring is resilientlydeformable.

3. The valve as claimed in claim 1 in which movement of the closuremember about its pivotal mounting means is such that in its openposition the plane of the closure member lies on a side of the axis ofthe passage opposite to the said pivotal mounting means.

1. A butterfly type fluid control valve comprising a body having athrough passage, said body being provided with an internal circularrecess at one end of the through passage, an annular retaining memberhaving a first flange and a second flange extending at right angles tothe first flange, said first flange being positioned in the recess, withsaid flanges cooperating with the recess to provide an internal annulargroove, means detachably securing the annular retaining member to thebody, a mounting ring within the annular groove and displaceable in thegroove in a plane perpendicular to the axis of the through passage, asealing element positioned between the mounting ring and the body, aseat ring carried by the mounting ring, said seat ring having an innerface extending into the passage and a face engaging the body inwardly ofthe sealing element, a valve closure member defined by a disc having apart spherical peripheral surface, means pivotally mounting the disc tothe body to be axially offset from the plane of the disc and from theaxis of the through passage, the part spherical peripheral surface ofthe disc being engageable with the inner face of the seat ring, and whenthe valve is shut, the center of the part spherical peripheral surfaceof the disc is the same distance from the plane of the disc as the axisof the pivotal mounting means and the center of the surface lies on theaxis of the through passage.
 2. The valve as claimed in claim 1 in whichthe seat ring is resiliently deformable.
 3. The valve as claimed inclaim 1 in which movement of the closure member about its pivotalmounting means is such that in its open position the plane of theclosure member lies on a side of the axis of the passage opposite to thesaid pivotal mounting means.